This was the only American carrier sunk in the Atlantic during WWII

While naval combat during WWII is often associated with great battles like Midway and Leyte Gulf, the ships in the Atlantic saw their share of action as well. German submarines hunted Allied convoys carrying vital war materiel to Britain and the Soviet Union. To combat them, anti-submarine hunter-killer groups were formed with fast destroyers and naval aircraft flying from escort carriers.

Smaller and slower than fleet carriers, escort carriers lacked the speed to keep up with battleships and cruisers. However, with a small but capable wing of aircraft, they excelled at escorting convoys by deterring enemy submarines and planes. USS Block Island (CVE-21) was a Bogue-class escort carrier that joined the Atlantic Fleet in 1943. She could carry up to 24 aircraft which was usually a mix of F4F Wildcat fighters and TBF Avenger torpedo-bombers.

A black and white photo showing a military aircraft being lifted by a large crane onto an aircraft carrier docked at a port. Another aircraft is on the ground nearby with several people standing around it. The aircraft carrier has multiple planes lined up on its deck and various antennas and equipment visible. — Block Island‘s first assignment was ferrying P-47 Thunderbolts to Ireland (U.S. Navy)

Block Island joined Task Group 21.1 and conducted four anti-submarine cruises with great success. Wildcats and Avengers from Block Island sank U-220 on October 28, 1943 and U-1059 on March 19, 1944. The carrier also shared two submarine kills with her escorts. U-801 was sunk on March 17, 1944 with the help of USS Corry (DD-463) and USS Bronstein (DE-189). On May 6, 1944, Block Island and USS Buckley (DE-51) sunk U-66.

A black and white photo of 18 men arranged in three rows, all wearing white t-shirts with the letters "PW" printed on them and dark pants. The men have various hairstyles and facial hair styles, and they are posing outdoors on what appears to be a ship deck. The bottom left corner of the photo has a "DECLASSIFIED" stamp, and the text below the group reads "GERMAN PRISONERS OFF U-66 (STAMAN)" and "DISCLOSURE 'C'". — *German POWs from* U-66 *on board* Block Island (U.S. Navy)

However, the carrier’s good fortune would not last. On May 29, 1944, U-549 slipped past Block Island‘s escorts and attacked her at 2013 hours off the Canary Islands. The submarine fired three torpedoes, two of which found their mark. Six of Block Island‘s sailors were killed in the explosions and the ship eventually sank. The 951 survivors were rescued by the escort screen. When Block Island was sunk, six of her Wildcats were in the air. With no place to land, the aviators tried to reach the Canary Islands but ran out of fuel and were forced to ditch in the water. Only two of the pilots were rescued. USS Eugene E. Elmore (DE-686) pursued U-549 and sank her.

A black and white aerial view of a military aircraft carrier at sea, featuring a flight deck loaded with multiple propeller-driven fighter planes arranged in rows. The ship is moving forward, creating a wake in the water behind it. The carrier has a central island structure with antennas and other equipment. — Block Island underway with Wildcats and Avengers on her deck (U.S. Navy)

12 days after Block Island‘s sinking, USS Block Island (CVE-106) was launched. The new Commencement Bay-class escort carrier was renamed in honor of the lost ship. The prior Block Island and her crew earned two battle stars during their service. Although she was successful her anti-submarine role, she stands out as the only American carrier to be sunk in the Atlantic during the war.